Company
About H+G Stahl
Service, power and know-how: since 1992 we have manufactured for industrial piping. Today, H+G Stahl GmbH in Hattingen combines steel supply, manufacturing and industrial valves.
- 1992Hahn und Gendreizig founded
- 6,000 m²production area in Hattingen
- 2000industrial valves since
- 24/7emergency service
Far more than a trader.
As a supplier of heat-resistant and special steels for power plant technology, refineries, chemical works and special piping, we offer not only steel and metals but also pre-machining and complete finish machining. And we deliver to you ourselves.
Since 2000 we have been building tailor-made valves. With our own design team, CAD/CAM systems and more than 20 years of know-how, we build individual valves to operating data – including welding, assembly and pressure testing on our own test bench.
Vision
To be a globally leading brand for industrial solutions – with innovative and sustainable production technologies that set standards.
Mission
High-quality products and flexible solutions precisely matched to customer requirements – with state-of-the-art technology, experienced teams and dynamic processes.
Our values
Our values
Quality & reliability
Strict compliance with international standards (DIN, EN, ASME/ANSI) and continuous quality control.
Customer focus
Individual project solutions, technical support and a 24/7 emergency service.
Innovation
CNC technology, welding expertise and materials competence.
Sustainability
Resource-efficient manufacturing methods for environmentally conscious solutions.
Teamwork
Long-term partnerships through shared goals.
History
From 1992 to today
- 1992
Hahn und Gendreizig GmbH founded
Frank Gendreizig and Lothar Hahn lay the foundation – specialised in workpieces for industrial piping.
- 2000
New CNC machines for valves
Entry into industrial valve manufacturing as a contract manufacturer.
- 2005
Machinery modernised
Investment in powerful new machines – vertical lathe and boring mill.
- 2008
New plant in Gelsenkirchen
Completion of the production hall on Lockhofstraße.
- 2011
Jan Gendreizig joins
Start of turnkey industrial valves for power plant technology.
- 2014
SIM Zerspanungstechnik founded
A welding shop extends the manufacturing service.
- 2021
Production hall in Hattingen
Purchase of a hall and office building – expansion to 6,000 m².
- 2024
H+G Stahl GmbH founded
For a broader range of industrial valves and steel supply including pre- and finish machining.
How we work
How an inquiry works
- 01
Send your inquiry
Drawing, material grade, standard designation or sample.
- 02
Agree on the solution
Material, dimensions, machining, testing and delivery date.
- 03
Manufacture & test
Sourcing, machining and inspection – in-house and by TÜV/material inspectors.
- 04
Deliver
Ready to install, documented – delivered directly to you on request.
Standards & testing
- DIN
- EN 1092-1
- ASME / ANSI
- API 6D
- API 609
- ISO 17292
- EN 12516
- EN 12266 / ISO 5208
- TÜV inspection
- Pressure testing on our own test bench
Industries
- Power generation
- Refineries & petrochemicals
- Chemicals
- Oil & gas
- Piping construction
- Machinery & plant engineering
- Steel & mining
- Cement
Location
Hattingen, North Rhine-Westphalia.
Administration and production share one site – short distances between sales, design and manufacturing.
Contact
Arrange a call or plant visit
For inquiries, technical questions or a visit to our Hattingen plant, contact us by phone or e-mail.